Method and apparatus for producing fiber pulp in a steam pressur

Details Method and apparatus for producing fiber pulp in a steam pressur Method and apparatus for producing fiber pulp in a steam pressur

1978-11-29

1980-11-25

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Mechanical defibration in the presence of heated gas or gas...

162 24, 162 28, 162 46, 162261, 241 28, 241 791, 241161, 241244, D21B 114, B27L 1108, B23C 2314

Patent

active

042356652

ABSTRACT:
Method and apparatus for producing pulp from moisture-containing lignocellulosic material, such as wood chips, which is ground in a grinding space defined between a pair of grinding discs which rotate relative to one another in an environment of pressurized steam generated during the grinding process, in a closed housing. The ground fiber or pulp discharged from the grinding housing is propelled by the accompanying steam into a cyclone, where the ground pulp is separated from the steam for further treatment, while the steam is recycled for further use in the pulping process. The pressure in the cyclone is so controlled that a pressure is maintained therein which is substantially equal to a pressure drop which is sufficient merely to maintain the propellant force of the steam to convey the ground pulp from the grinding housing to the cyclone while discharging the separated steam and recycling it for further use in the pulping process.

REFERENCES:
patent: 3661328 (1972-05-01), Leask
patent: 3847363 (1974-11-01), Reinhall
patent: 4012279 (1977-03-01), Selander et al.
patent: 4136831 (1979-01-01), Cederquist et al.

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